Double drum hoist



May 29, 1945.

F. P. LAWLER 2,376,972

DOUBLE DRUM HOIST s sheets-sheet 1 Filed Jan. 3, 1944 y FICHI llllll//ll//l www ATTORNEYS Sheets-Sheet '2 F. P. LAWl-.ER

DOUBLE DRUM HogsT Filed Jan. 3, 1944 May 29, 194s.

May 129, 1945 F. P. LAwLER DOUBLE DRUM.Ho1sT 5 Sheets-Sheet 3 Filed Jan. Q5, 1944 xT, f Tllllw Z 0 6 V235 Proz?, 3 3 Z INVENTM FRANK P. LAWLER BY (Wmf/oy A TTOH/VEYS Patented May 29, 1945 .UNITED STATES gATfE-NT' FFICE DoULi:iititinoisir I n A "j n y Supply Corporation, Philadelphia, Pa., a corporation of Pennsylvania Application January 3, 1944, serial No. 516,836

v e 3 Claims.

This invention relates to .a double drum hoist unit Which is especially adapted for use as a power control unit for the operation of lifting cranes and the like.

The object of the present invention is generally to improve and simplify the construction and operation of double drum hoists; toprovide a crane power control unit whichfis substantially foolproof and which embodies a maximum number of safety features; to provide a double drum hoist unit in which one of the drums can only be driven under power in both directions, While the other drum can optionally be so controlled, or freespooled as conditions require; to provide a double drum hoisting unit in which a common reversing gearset, controlled by a single lever, is arranged so that it can drive either drum in a forward or reverse direction; to provide a double drum hoisting unit in which the two 'drums and connected driving mechanism are substantially identical to permit .interchange of parts and to provideV a crane power control unit which can be completely controlled by means of only two levers.

The double drum hoist is shown by Way of illustration in the accompanying drawings in which Fig. 1 is a plan view of the double drum'hoist;

Fig. 2 is a section taken on line 2 2 of Fig. 1;

Fig. 3 is a cross section on line 3 3 of Fig. 1;

Fig. 4 is a cross section on line 4 4 of Fig. 1;

Fig. 5 is a cross section on line 5 5 of Fig. 1;

Fig. 6 is a cross section on line 6 6 of Fig. 1;

and

Fig. 7 is a perspective view of the complete double drum hoist.

Referring to the drawings in detail and especially Figs. 1, 2 and 7, A indicates a centrally disshaft and secured on the inner end thereof in a position where it will mesh and simultaneously drive the gears I I and I2 is a drive gear pinion I5.

Extending through the worm gear pinions 1 and 8y and through'the bevelled gears vII and I2 is al shaft 2| extending through the central housing AA and the outer end of` said shaft is provided with a selector lever 22, the function' of which .will hereinafter be described. The countershaft .I6 extends beyond the outer end of each worm gear pinion 'I and 8. These extending ends carry jaw vclutches 23 andv 24 which cooperate' with jaw clutches 24a and 23a formed on the adjacent ends of the respective worm gear pinions 'I and 8. The clutch member 23 is straddled by a forked arm 25 which is secured on a shaft 26. The clutch member 24 is similarly straddled by a forked `arm 2'I secured on a shaft 28.l The shafts 26'and 28 project outside of the housings D and F and the outer endsare pro-vided with levers 29 and 30 (see Fig. 7,) which in turnare connected by a link'3l.

The lever 30 is provided Witha knob or'handle 32 posed housing which is anged'at 2 on each side, g

Secured 'by bolts 3 or similar means to the flanges 2 are a pair of Worm gear pinion housings B and C and secured to the top or upper'surface of said housings are worm gear housings B and C. The pinion housings B and C are provided with pedestals or bases 4 and 5 to permit them to be secured to a suitable frame or sup-port, and the outer ends Y a cooperating clutch face 39 formed in the interior whereby both levers 29 and 30 vare operated in unison. When the lever 30 assumes a position indicated as neutral in Fig. 'l Iboth of the jaw clutches 23 and 24 Will be out of engagement. `On

the other hand, if the lever 30 is yswung either to the right or the left one or another'of the jaw clutches will be engaged and power will thus be transmitted to one or another of the ,Worm gear pinions'l or8. y

J ournalled in the housing C is a drum driving shaft 34. `Secured on said shaft and intermeshing with the Worm gear pinion 8 is a worm gear 35 and secured on'the shaft 34 exterior of the housing C' is a cable drum 36. Similarly journalled in the housing B is adrum driving shaft 31. Secured on said shaft is a worm gear 35a vwhich meshes with the worm gear pinion 1 and splined to one end of shaft 3l is a cone clutch 38 which is adapted to move into or out of engagement with of a housing 40 which forms-a part` of' a cable drum 4I. This drum is journalled on a sleeve extension 42 forming part of the housing B (s'ee Fig, 5). A spring 43 is interposed between the cone clutch 38 and a thrust collar 44 and normally functions to maintain the clutch ymembers 7) formed on the hub 46 of a leve r 41.

hub is rotatable on a bearing sleeve 48 carried by the housing B" and when rotated bymeans ofl Alever 41 it moves vinto or out of engagement with 2fn l r 38 and 39 in engagement. The clutch 38 may,

however, be disengaged by a cam member 45 (s ee y a cooperating cam 45a forming part of the'housing B.

shaft. A. rod. 48 fprojects This The drum driving shaft 31- is .a tubular therethroughand through the hub 46 of lever 41. A thrust bearing` 49 is mounted inthe outer end of the hub 46 and-: this is engaged by nuts 50 securedon a threaded it is possible -to either raise or lower the boom by driving the counter shaft I6 'in one `direction or another, said drive being controlled by the clutch I1 engaging one or another of the bevelled gears Il or l2. Whether thevboom isbeing raised or lowered, power will be required. If itis desired to raise or lower a load, jaw clutch members 23 extensionl of'the rod.r The opposite end of .the rod is provided with a head 5I which engages the;

clutch 38. Thus when lever .412. isV rotated tobring the cams 45 and 45a into engagement, clutch 38 is moved inwardly o-r away from the cooperating clutch 39 thus causing disengagementof the drum'y'- Y drum.

droppedfwiththis arrangement v s Thefdrum indicatedat 4|2lwillhereinafterl-fbereferred :fto as. '-1 the load-,line-drumJ 1 also.:power.driven when-raising ior.'lowering=-a Q drive.

From the foregoing, it-Will be noted that two cablet.drums:.are; provided...= Thus .theistruc'turef forms..a.f.double idrumzhoistunit vwhich inlthisa 1- instance l.isrparticularly :designed 1 forsthe.: opera-..- I tionf-.of cranes andfthea'liket I-n.practically. all. crane-.structures la .boom:is..provided ./which .must be.-.raised=or..lowered.YV Thus, .one IdrumM-is .-pro-.

vided` for `f the. purpose of raising. ,orf lowering. -f the;

y boom -andffthe otherfdrum is. provided -f-for rthe.,

purpose .fof: raising. or^..-lowering Aa load- Experi.- l

ence has... shown a that. the v'cable :which controlsi and..23a are engaged andpower will`thus be transmitted from the counter-shaft to the worm gear pinion 1. This in turn drives theworm gear 35a and shaft 31 and through clutch 38 the load raising or` lowering drum'will be driven and .itwill be power driven either when raisingr or lowering .by engaging clutch I1 with one or anothenof thebevelled gears Il or I 2. If the tractoremotorgshould fail while a load is sus pended, drum 4| may be released as previously described.- bypartially releasing clutch 38 throughlmeans of the lever 41. This lever is connected with lever 22 which actuates clutch |1througharod.f22a. v l

From.- theaf yforegoingv it."should` be noted 'that the..idoublewdruln hoist is completelycontrolledi by two levers, to wit, the lever-30fuwhi`chthroughiv thefclu'tches l235fand-w24'.determines which cable n drum: is :toy be idriven.'A and the,Y lever L41f= whi'ch'v controlsclutchi 1 and-through cams 4 5ian'd' 4511,;`

f clutch38 -1 In other words; lever 30'ffcontrolsifor1 the--raisingor lowering of 1.a boom-should:be-.opa`

erated .throughy a vself -locking Lwormffgear set/vso up .and zdown. In ftheA `presents.structure,i the; cable'idrum 36 is employed-.floriraising and.loW-v eringthe boom and it cannot.beloperatedfexethattheboomimust always be powendriven bothz` cept; by a -power drive.,l This :drum will i hereinI aiterqr be.v referred. Lto as lathe.. boom-topping Thel boom cannot be.. accidentallyv 1 1 load, .but;as va.clutchlisiprovide'das: indicated atl l thefsafetyfe'atures and desirable operating' .chareI acteristicsrequired forfall classes .of-.crane-opm to .thedrivin'g-.shaft 31: so. as. to Vrenderthedrum4 free-spooling. f Free-.spooling -oftherdrum'is onlyresorted toinacases` of emergency For instance',f. if =the.driving motorifails`=and.a floadais.suspended,r` it is: `possible .tolower-.the -1oad=by ip'artiallyl re l leasingthe-.clutch In othenwords; the double. 1 drumf'hoist, here shown, provides- =aA boom'ftopw 'ping-drum v4and ya loadfline-drum which AShave .all 1 erationzandfbecause .a common 4reversingkgeartis 1 l employedI all of these.l desirable featuresareavail^- able through the movement of only twou control.- leversytofwit; a drum?selectorxlever` ndicatedwat 30 andia control i=lever indicated.: at; 41.. I In:actual.operation .letf it be; assumed .thatz the.. i double :drum hoist-.here shown,ris:.mounted ron: 1 a tractor .and .that,=.power to;.operatettheehoistais.` f transmitted from i .thehpower .take'eoft.'shaft bof the,..tract0r to .theshaftrl of .the hoist; PowerI from the. Atractormotor :is thus ftransmitted :':to A

operate .1 the4 .doublet` drum: hoist :rand i power; .may

be; transmitted x.ato either ecableffdrurn-i asdcondie tionsndemand. Forninstanceiiif Lit; isidesiredtto 1 raisegor. lower. the.:boomtjawuclutchesf:Zlkand 24m will1be engaged soastto, transmit power fromthe. i

counter shaft-I6 :to thefwormgear.pinionf andl intermeshing worm :igear .35.11; Tl's1i1rt1irn4 trans-fi.

mitsipower. through shaftz 34 to. drum .361 sandias.

thisslconnected to:a boombya cable;V not shown,` 1

selects the drum to be=drivenwhi1elever=41 rst controls' .the:direction:ofrotationiofthe drumfI whichfisndriven and besides that 'controls' freeI reeling-.ofv one of the. drums. Under normal Jeon-l ditions2both1drums are positivelydrivenfin both directions; a vsafety Ifactor 'which 2- is-.of l '-considfA erablevfimportance; besides ythat the ,-lo'ad .eline-- drum Y, 4 If, may be rendered',freeereeling in; cases oiI emergency .orifotherwiset.V Both fdrum -structures and connectedfdrivingi mechanism1 is `esub-VA stantiallyy identic'al. thus permitting interchange ing eof 1 parts whenevernecessary;1` The-drivel for each drum is basedfon self-locking-wormgears finish of the several parts employed?rna'yibe: i variedaccording. tozthe,.experience `of theimanuf t facturer: andvaryingnconditions of useefmay ole-r`v manda v f f i Having 4thus=described f and.- illustrated vrnyviin--` vention,y whatHI claimtand wish to secure #by Letters Patent lis f 1. In -a hoist :ofthe.,charaeter'describedia hou's-e ing,1.adrive anda countershaftj ournaled therein,

journalediiri fthe-housing and---throughwhich the countersliaftl extends ,za bevel -gear pinionffonrthedrive shaft and meshing the opposedbevel^-`gearsf todrive said gearsgin opposite:.'directions; a `clutch mem-ben iongze'ach l.v-.ofV the.-adJacent,v faces @.ofaithe.: opposed f bevel gears ,a a .clutc-h'. member 'splindto then'countershafti between the. opposedybevelj gears, means for; selectivelyv engaging said cclute'hi,

' withth'eiclutch: member o'i: eitherfof tthei'opposed.i

bevel;V gears tol drivexthe, countershaftffinj one-adir; rectiontorithe othenifa' :painof .worm gear pin-ions;

" journalediin thefhousingzfand throughwhiclaathe` countersha'ft extends, a clutch member on each worm gear pinion, a pair of cooperating clutch members splined to the countershaft, one adjacent each Worm gear pinion, clutch means for selectively engaging one or another of said p-air of clutches with an adjacent kWorm gear pinion clutch to drive one or another of the worm gear pinions, a pair of cable drums, and means for transmitting power from each worm gear pinion to a cable drum.

2. In a hoist of the character described a housing, a drive anda countershaft journaled therein, a pair of opposed freely rotatable bevel gears journaled in the housing and through which the countersha-ft extends, a bevel ,gear pinion on the drive shaft and meshing the opposed bevel gears to drive said gears in opposite directions, a clutch member on each of the adj-acent faces of the opposed bevel gears, a clutch member splined to the countershaft between the opposed bevel gears, means for selectively engaging said clutchv with the clutch member of either of the opposed bevel gears to drive the countershaft in one direction or the other, a pair of worm gear pinions journaled in the housing and through which the countersh-aft extends, a clutch member on each worm gear pinion, a pair of cooperating clutch members splined to the countershaft, one adjacent each worm gear pinion, clutch means for selectively engaging one or another of said pair of clutches with an adjacent worm gear pinion clutch to drive one or another of the worm gear pinions, a pair of drum driving shafts journaled in the4 housing, a Worm gear on eachj of said shafts and meshing with the respective worm gear pinions, and a cable drum adapted to be driven by each drum driving shaft.

3. In a hoist of the character described a housing, a drive and a countershaft journaled therein,`

a pair of opposed freely rotatable bevel gears journalecl in the housing and through which the countershaft extends, a bevel "gear pinion on the drive shaft 1and meshing the opposed bevel gears to drive said gears in Opposite directions, a clutch vmember' `on each of the ladjacent faces of the.

i. members splined to the countershaft, one adja- .second named drum.

cent each Worm gear pinion, clutch means for selectively engaging one or another of said pair of clutches with an adjacent Worm gear pinion clutch to drive one or another of the worm gear pinions, a pair of drum driving shafts journaled in the housing, a Worm gear on each of said shafts and meshing with the respective worm gear pinions,v a cable drum positively secured to one drum driving shaft and Adriven thereby, a second cable drum, a clutch normally formingv a drive between said second named drum and the other drum driving shaft, and means for releas-` ing said `clutch to permit iree-spooling of said FRANK P. LAWLER. 

